Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a68e3cfa48aa92bf65b58dd0cbc70e574b91fdc606598793d93497ad9215a11' 
  AND token = 'k5PYySmgtKOE8XxPIxbRewSv/rAM3gSgwxQMc8FJrlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}